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"use strict";
var _interopRequireDefault = require("@babel/runtime/helpers/interopRequireDefault").default;
Object.defineProperty(exports, "__esModule", {
value: true
});
exports.default = differenceInISOWeekYears;
var _index = _interopRequireDefault(require("../toDate/index.js"));
var _index2 = _interopRequireDefault(require("../differenceInCalendarISOWeekYears/index.js"));
var _index3 = _interopRequireDefault(require("../compareAsc/index.js"));
var _index4 = _interopRequireDefault(require("../subISOWeekYears/index.js"));
var _index5 = _interopRequireDefault(require("../_lib/requiredArgs/index.js"));
/**
* @name differenceInISOWeekYears
* @category ISO Week-Numbering Year Helpers
* @summary Get the number of full ISO week-numbering years between the given dates.
*
* @description
* Get the number of full ISO week-numbering years between the given dates.
*
* ISO week-numbering year: http://en.wikipedia.org/wiki/ISO_week_date
*
* @param {Date|Number} dateLeft - the later date
* @param {Date|Number} dateRight - the earlier date
* @returns {Number} the number of full ISO week-numbering years
* @throws {TypeError} 2 arguments required
*
* @example
* // How many full ISO week-numbering years are between 1 January 2010 and 1 January 2012?
* const result = differenceInISOWeekYears(
* new Date(2012, 0, 1),
* new Date(2010, 0, 1)
* )
* //=> 1
*/
function differenceInISOWeekYears(dirtyDateLeft, dirtyDateRight) {
(0, _index5.default)(2, arguments);
var dateLeft = (0, _index.default)(dirtyDateLeft);
var dateRight = (0, _index.default)(dirtyDateRight);
var sign = (0, _index3.default)(dateLeft, dateRight);
var difference = Math.abs((0, _index2.default)(dateLeft, dateRight));
dateLeft = (0, _index4.default)(dateLeft, sign * difference);
// Math.abs(diff in full ISO years - diff in calendar ISO years) === 1
// if last calendar ISO year is not full
// If so, result must be decreased by 1 in absolute value
var isLastISOWeekYearNotFull = Number((0, _index3.default)(dateLeft, dateRight) === -sign);
var result = sign * (difference - isLastISOWeekYearNotFull);
// Prevent negative zero
return result === 0 ? 0 : result;
}
module.exports = exports.default;
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